I wouldn't pay for it. I'd just wait for someone to upload all the shiny new HQ dats somewhere.
Well of course they would have to upgrade the engine to make them work and force it to verify with a code, as all other expansions have in the past.

I'd pay for upgrade player models alone, i'm not a sure full graphics upgrade would ever happen due to the work involved. Assuming they the original pictures were not done hi-res and it ported down ofc.